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llvm/lib/Support/UnicodeCaseFold.cpp
Pavel Labath 274527c9b5 Resubmit r325107 (case folding DJB hash) 
The issue was that the has function was generating different results depending
on the signedness of char on the host platform. This commit fixes the issue by
explicitly using an unsigned char type to prevent sign extension and
adds some extra tests.

The original commit message was:

This patch implements a variant of the DJB hash function which folds the
input according to the algorithm in the Dwarf 5 specification (Section
6.1.1.4.5), which in turn references the Unicode Standard (Section 5.18,
"Case Mappings").

To achieve this, I have added a llvm::sys::unicode::foldCharSimple
function, which performs this mapping. The implementation of this
function was generated from the CaseMatching.txt file from the Unicode
spec using a python script (which is also included in this patch). The
script tries to optimize the function by coalescing adjecant mappings
with the same shift and stride (terms I made up). Theoretically, it
could be made a bit smarter and merge adjecant blocks that were
interrupted by only one or two characters with exceptional mapping, but
this would save only a couple of branches, while it would greatly
complicate the implementation, so I deemed it was not worth it.

Since we assume that the vast majority of the input characters will be
US-ASCII, the folding hash function has a fast-path for handling these,
and only whips out the full decode+fold+encode logic if we encounter a
character outside of this range. It might be possible to implement the
folding directly on utf8 sequences, but this would also bring a lot of
complexity for the few cases where we will actually need to process
non-ascii characters.

Reviewers: JDevlieghere, aprantl, probinson, dblaikie

Subscribers: mgorny, hintonda, echristo, clayborg, vleschuk, llvm-commits

Differential Revision: https://reviews.llvm.org/D42740

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325732 91177308-0d34-0410-b5e6-96231b3b80d8
2018-02-21 22:36:31 +00:00

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//===---------- Support/UnicodeCaseFold.cpp -------------------------------===//
//
// This file was generated by utils/unicode-case-fold.py from the Unicode
// case folding database at
// http://www.unicode.org/Public/9.0.0/ucd/CaseFolding.txt
//
// To regenerate this file, run:
// utils/unicode-case-fold.py \
// "http://www.unicode.org/Public/9.0.0/ucd/CaseFolding.txt" \
// > lib/Support/UnicodeCaseFold.cpp
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Unicode.h"
int llvm::sys::unicode::foldCharSimple(int C) {
if (C < 0x0041)
return C;
// 26 characters
if (C <= 0x005a)
return C + 32;
// MICRO SIGN
if (C == 0x00b5)
return 0x03bc;
if (C < 0x00c0)
return C;
// 23 characters
if (C <= 0x00d6)
return C + 32;
if (C < 0x00d8)
return C;
// 7 characters
if (C <= 0x00de)
return C + 32;
if (C < 0x0100)
return C;
// 24 characters
if (C <= 0x012e)
return C | 1;
if (C < 0x0132)
return C;
// 3 characters
if (C <= 0x0136)
return C | 1;
if (C < 0x0139)
return C;
// 8 characters
if (C <= 0x0147 && C % 2 == 1)
return C + 1;
if (C < 0x014a)
return C;
// 23 characters
if (C <= 0x0176)
return C | 1;
// LATIN CAPITAL LETTER Y WITH DIAERESIS
if (C == 0x0178)
return 0x00ff;
if (C < 0x0179)
return C;
// 3 characters
if (C <= 0x017d && C % 2 == 1)
return C + 1;
// LATIN SMALL LETTER LONG S
if (C == 0x017f)
return 0x0073;
// LATIN CAPITAL LETTER B WITH HOOK
if (C == 0x0181)
return 0x0253;
if (C < 0x0182)
return C;
// 2 characters
if (C <= 0x0184)
return C | 1;
// LATIN CAPITAL LETTER OPEN O
if (C == 0x0186)
return 0x0254;
// LATIN CAPITAL LETTER C WITH HOOK
if (C == 0x0187)
return 0x0188;
if (C < 0x0189)
return C;
// 2 characters
if (C <= 0x018a)
return C + 205;
// LATIN CAPITAL LETTER D WITH TOPBAR
if (C == 0x018b)
return 0x018c;
// LATIN CAPITAL LETTER REVERSED E
if (C == 0x018e)
return 0x01dd;
// LATIN CAPITAL LETTER SCHWA
if (C == 0x018f)
return 0x0259;
// LATIN CAPITAL LETTER OPEN E
if (C == 0x0190)
return 0x025b;
// LATIN CAPITAL LETTER F WITH HOOK
if (C == 0x0191)
return 0x0192;
// LATIN CAPITAL LETTER G WITH HOOK
if (C == 0x0193)
return 0x0260;
// LATIN CAPITAL LETTER GAMMA
if (C == 0x0194)
return 0x0263;
// LATIN CAPITAL LETTER IOTA
if (C == 0x0196)
return 0x0269;
// LATIN CAPITAL LETTER I WITH STROKE
if (C == 0x0197)
return 0x0268;
// LATIN CAPITAL LETTER K WITH HOOK
if (C == 0x0198)
return 0x0199;
// LATIN CAPITAL LETTER TURNED M
if (C == 0x019c)
return 0x026f;
// LATIN CAPITAL LETTER N WITH LEFT HOOK
if (C == 0x019d)
return 0x0272;
// LATIN CAPITAL LETTER O WITH MIDDLE TILDE
if (C == 0x019f)
return 0x0275;
if (C < 0x01a0)
return C;
// 3 characters
if (C <= 0x01a4)
return C | 1;
// LATIN LETTER YR
if (C == 0x01a6)
return 0x0280;
// LATIN CAPITAL LETTER TONE TWO
if (C == 0x01a7)
return 0x01a8;
// LATIN CAPITAL LETTER ESH
if (C == 0x01a9)
return 0x0283;
// LATIN CAPITAL LETTER T WITH HOOK
if (C == 0x01ac)
return 0x01ad;
// LATIN CAPITAL LETTER T WITH RETROFLEX HOOK
if (C == 0x01ae)
return 0x0288;
// LATIN CAPITAL LETTER U WITH HORN
if (C == 0x01af)
return 0x01b0;
if (C < 0x01b1)
return C;
// 2 characters
if (C <= 0x01b2)
return C + 217;
if (C < 0x01b3)
return C;
// 2 characters
if (C <= 0x01b5 && C % 2 == 1)
return C + 1;
// LATIN CAPITAL LETTER EZH
if (C == 0x01b7)
return 0x0292;
if (C < 0x01b8)
return C;
// 2 characters
if (C <= 0x01bc && C % 4 == 0)
return C + 1;
// LATIN CAPITAL LETTER DZ WITH CARON
if (C == 0x01c4)
return 0x01c6;
// LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
if (C == 0x01c5)
return 0x01c6;
// LATIN CAPITAL LETTER LJ
if (C == 0x01c7)
return 0x01c9;
// LATIN CAPITAL LETTER L WITH SMALL LETTER J
if (C == 0x01c8)
return 0x01c9;
// LATIN CAPITAL LETTER NJ
if (C == 0x01ca)
return 0x01cc;
if (C < 0x01cb)
return C;
// 9 characters
if (C <= 0x01db && C % 2 == 1)
return C + 1;
if (C < 0x01de)
return C;
// 9 characters
if (C <= 0x01ee)
return C | 1;
// LATIN CAPITAL LETTER DZ
if (C == 0x01f1)
return 0x01f3;
if (C < 0x01f2)
return C;
// 2 characters
if (C <= 0x01f4)
return C | 1;
// LATIN CAPITAL LETTER HWAIR
if (C == 0x01f6)
return 0x0195;
// LATIN CAPITAL LETTER WYNN
if (C == 0x01f7)
return 0x01bf;
if (C < 0x01f8)
return C;
// 20 characters
if (C <= 0x021e)
return C | 1;
// LATIN CAPITAL LETTER N WITH LONG RIGHT LEG
if (C == 0x0220)
return 0x019e;
if (C < 0x0222)
return C;
// 9 characters
if (C <= 0x0232)
return C | 1;
// LATIN CAPITAL LETTER A WITH STROKE
if (C == 0x023a)
return 0x2c65;
// LATIN CAPITAL LETTER C WITH STROKE
if (C == 0x023b)
return 0x023c;
// LATIN CAPITAL LETTER L WITH BAR
if (C == 0x023d)
return 0x019a;
// LATIN CAPITAL LETTER T WITH DIAGONAL STROKE
if (C == 0x023e)
return 0x2c66;
// LATIN CAPITAL LETTER GLOTTAL STOP
if (C == 0x0241)
return 0x0242;
// LATIN CAPITAL LETTER B WITH STROKE
if (C == 0x0243)
return 0x0180;
// LATIN CAPITAL LETTER U BAR
if (C == 0x0244)
return 0x0289;
// LATIN CAPITAL LETTER TURNED V
if (C == 0x0245)
return 0x028c;
if (C < 0x0246)
return C;
// 5 characters
if (C <= 0x024e)
return C | 1;
// COMBINING GREEK YPOGEGRAMMENI
if (C == 0x0345)
return 0x03b9;
if (C < 0x0370)
return C;
// 2 characters
if (C <= 0x0372)
return C | 1;
// GREEK CAPITAL LETTER PAMPHYLIAN DIGAMMA
if (C == 0x0376)
return 0x0377;
// GREEK CAPITAL LETTER YOT
if (C == 0x037f)
return 0x03f3;
// GREEK CAPITAL LETTER ALPHA WITH TONOS
if (C == 0x0386)
return 0x03ac;
if (C < 0x0388)
return C;
// 3 characters
if (C <= 0x038a)
return C + 37;
// GREEK CAPITAL LETTER OMICRON WITH TONOS
if (C == 0x038c)
return 0x03cc;
if (C < 0x038e)
return C;
// 2 characters
if (C <= 0x038f)
return C + 63;
if (C < 0x0391)
return C;
// 17 characters
if (C <= 0x03a1)
return C + 32;
if (C < 0x03a3)
return C;
// 9 characters
if (C <= 0x03ab)
return C + 32;
// GREEK SMALL LETTER FINAL SIGMA
if (C == 0x03c2)
return 0x03c3;
// GREEK CAPITAL KAI SYMBOL
if (C == 0x03cf)
return 0x03d7;
// GREEK BETA SYMBOL
if (C == 0x03d0)
return 0x03b2;
// GREEK THETA SYMBOL
if (C == 0x03d1)
return 0x03b8;
// GREEK PHI SYMBOL
if (C == 0x03d5)
return 0x03c6;
// GREEK PI SYMBOL
if (C == 0x03d6)
return 0x03c0;
if (C < 0x03d8)
return C;
// 12 characters
if (C <= 0x03ee)
return C | 1;
// GREEK KAPPA SYMBOL
if (C == 0x03f0)
return 0x03ba;
// GREEK RHO SYMBOL
if (C == 0x03f1)
return 0x03c1;
// GREEK CAPITAL THETA SYMBOL
if (C == 0x03f4)
return 0x03b8;
// GREEK LUNATE EPSILON SYMBOL
if (C == 0x03f5)
return 0x03b5;
// GREEK CAPITAL LETTER SHO
if (C == 0x03f7)
return 0x03f8;
// GREEK CAPITAL LUNATE SIGMA SYMBOL
if (C == 0x03f9)
return 0x03f2;
// GREEK CAPITAL LETTER SAN
if (C == 0x03fa)
return 0x03fb;
if (C < 0x03fd)
return C;
// 3 characters
if (C <= 0x03ff)
return C + -130;
if (C < 0x0400)
return C;
// 16 characters
if (C <= 0x040f)
return C + 80;
if (C < 0x0410)
return C;
// 32 characters
if (C <= 0x042f)
return C + 32;
if (C < 0x0460)
return C;
// 17 characters
if (C <= 0x0480)
return C | 1;
if (C < 0x048a)
return C;
// 27 characters
if (C <= 0x04be)
return C | 1;
// CYRILLIC LETTER PALOCHKA
if (C == 0x04c0)
return 0x04cf;
if (C < 0x04c1)
return C;
// 7 characters
if (C <= 0x04cd && C % 2 == 1)
return C + 1;
if (C < 0x04d0)
return C;
// 48 characters
if (C <= 0x052e)
return C | 1;
if (C < 0x0531)
return C;
// 38 characters
if (C <= 0x0556)
return C + 48;
if (C < 0x10a0)
return C;
// 38 characters
if (C <= 0x10c5)
return C + 7264;
if (C < 0x10c7)
return C;
// 2 characters
if (C <= 0x10cd && C % 6 == 5)
return C + 7264;
if (C < 0x13f8)
return C;
// 6 characters
if (C <= 0x13fd)
return C + -8;
// CYRILLIC SMALL LETTER ROUNDED VE
if (C == 0x1c80)
return 0x0432;
// CYRILLIC SMALL LETTER LONG-LEGGED DE
if (C == 0x1c81)
return 0x0434;
// CYRILLIC SMALL LETTER NARROW O
if (C == 0x1c82)
return 0x043e;
if (C < 0x1c83)
return C;
// 2 characters
if (C <= 0x1c84)
return C + -6210;
// CYRILLIC SMALL LETTER THREE-LEGGED TE
if (C == 0x1c85)
return 0x0442;
// CYRILLIC SMALL LETTER TALL HARD SIGN
if (C == 0x1c86)
return 0x044a;
// CYRILLIC SMALL LETTER TALL YAT
if (C == 0x1c87)
return 0x0463;
// CYRILLIC SMALL LETTER UNBLENDED UK
if (C == 0x1c88)
return 0xa64b;
if (C < 0x1e00)
return C;
// 75 characters
if (C <= 0x1e94)
return C | 1;
// LATIN SMALL LETTER LONG S WITH DOT ABOVE
if (C == 0x1e9b)
return 0x1e61;
// LATIN CAPITAL LETTER SHARP S
if (C == 0x1e9e)
return 0x00df;
if (C < 0x1ea0)
return C;
// 48 characters
if (C <= 0x1efe)
return C | 1;
if (C < 0x1f08)
return C;
// 8 characters
if (C <= 0x1f0f)
return C + -8;
if (C < 0x1f18)
return C;
// 6 characters
if (C <= 0x1f1d)
return C + -8;
if (C < 0x1f28)
return C;
// 8 characters
if (C <= 0x1f2f)
return C + -8;
if (C < 0x1f38)
return C;
// 8 characters
if (C <= 0x1f3f)
return C + -8;
if (C < 0x1f48)
return C;
// 6 characters
if (C <= 0x1f4d)
return C + -8;
if (C < 0x1f59)
return C;
// 4 characters
if (C <= 0x1f5f && C % 2 == 1)
return C + -8;
if (C < 0x1f68)
return C;
// 8 characters
if (C <= 0x1f6f)
return C + -8;
if (C < 0x1f88)
return C;
// 8 characters
if (C <= 0x1f8f)
return C + -8;
if (C < 0x1f98)
return C;
// 8 characters
if (C <= 0x1f9f)
return C + -8;
if (C < 0x1fa8)
return C;
// 8 characters
if (C <= 0x1faf)
return C + -8;
if (C < 0x1fb8)
return C;
// 2 characters
if (C <= 0x1fb9)
return C + -8;
if (C < 0x1fba)
return C;
// 2 characters
if (C <= 0x1fbb)
return C + -74;
// GREEK CAPITAL LETTER ALPHA WITH PROSGEGRAMMENI
if (C == 0x1fbc)
return 0x1fb3;
// GREEK PROSGEGRAMMENI
if (C == 0x1fbe)
return 0x03b9;
if (C < 0x1fc8)
return C;
// 4 characters
if (C <= 0x1fcb)
return C + -86;
// GREEK CAPITAL LETTER ETA WITH PROSGEGRAMMENI
if (C == 0x1fcc)
return 0x1fc3;
if (C < 0x1fd8)
return C;
// 2 characters
if (C <= 0x1fd9)
return C + -8;
if (C < 0x1fda)
return C;
// 2 characters
if (C <= 0x1fdb)
return C + -100;
if (C < 0x1fe8)
return C;
// 2 characters
if (C <= 0x1fe9)
return C + -8;
if (C < 0x1fea)
return C;
// 2 characters
if (C <= 0x1feb)
return C + -112;
// GREEK CAPITAL LETTER RHO WITH DASIA
if (C == 0x1fec)
return 0x1fe5;
if (C < 0x1ff8)
return C;
// 2 characters
if (C <= 0x1ff9)
return C + -128;
if (C < 0x1ffa)
return C;
// 2 characters
if (C <= 0x1ffb)
return C + -126;
// GREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENI
if (C == 0x1ffc)
return 0x1ff3;
// OHM SIGN
if (C == 0x2126)
return 0x03c9;
// KELVIN SIGN
if (C == 0x212a)
return 0x006b;
// ANGSTROM SIGN
if (C == 0x212b)
return 0x00e5;
// TURNED CAPITAL F
if (C == 0x2132)
return 0x214e;
if (C < 0x2160)
return C;
// 16 characters
if (C <= 0x216f)
return C + 16;
// ROMAN NUMERAL REVERSED ONE HUNDRED
if (C == 0x2183)
return 0x2184;
if (C < 0x24b6)
return C;
// 26 characters
if (C <= 0x24cf)
return C + 26;
if (C < 0x2c00)
return C;
// 47 characters
if (C <= 0x2c2e)
return C + 48;
// LATIN CAPITAL LETTER L WITH DOUBLE BAR
if (C == 0x2c60)
return 0x2c61;
// LATIN CAPITAL LETTER L WITH MIDDLE TILDE
if (C == 0x2c62)
return 0x026b;
// LATIN CAPITAL LETTER P WITH STROKE
if (C == 0x2c63)
return 0x1d7d;
// LATIN CAPITAL LETTER R WITH TAIL
if (C == 0x2c64)
return 0x027d;
if (C < 0x2c67)
return C;
// 3 characters
if (C <= 0x2c6b && C % 2 == 1)
return C + 1;
// LATIN CAPITAL LETTER ALPHA
if (C == 0x2c6d)
return 0x0251;
// LATIN CAPITAL LETTER M WITH HOOK
if (C == 0x2c6e)
return 0x0271;
// LATIN CAPITAL LETTER TURNED A
if (C == 0x2c6f)
return 0x0250;
// LATIN CAPITAL LETTER TURNED ALPHA
if (C == 0x2c70)
return 0x0252;
if (C < 0x2c72)
return C;
// 2 characters
if (C <= 0x2c75 && C % 3 == 2)
return C + 1;
if (C < 0x2c7e)
return C;
// 2 characters
if (C <= 0x2c7f)
return C + -10815;
if (C < 0x2c80)
return C;
// 50 characters
if (C <= 0x2ce2)
return C | 1;
if (C < 0x2ceb)
return C;
// 2 characters
if (C <= 0x2ced && C % 2 == 1)
return C + 1;
if (C < 0x2cf2)
return C;
// 2 characters
if (C <= 0xa640 && C % 31054 == 11506)
return C + 1;
if (C < 0xa642)
return C;
// 22 characters
if (C <= 0xa66c)
return C | 1;
if (C < 0xa680)
return C;
// 14 characters
if (C <= 0xa69a)
return C | 1;
if (C < 0xa722)
return C;
// 7 characters
if (C <= 0xa72e)
return C | 1;
if (C < 0xa732)
return C;
// 31 characters
if (C <= 0xa76e)
return C | 1;
if (C < 0xa779)
return C;
// 2 characters
if (C <= 0xa77b && C % 2 == 1)
return C + 1;
// LATIN CAPITAL LETTER INSULAR G
if (C == 0xa77d)
return 0x1d79;
if (C < 0xa77e)
return C;
// 5 characters
if (C <= 0xa786)
return C | 1;
// LATIN CAPITAL LETTER SALTILLO
if (C == 0xa78b)
return 0xa78c;
// LATIN CAPITAL LETTER TURNED H
if (C == 0xa78d)
return 0x0265;
if (C < 0xa790)
return C;
// 2 characters
if (C <= 0xa792)
return C | 1;
if (C < 0xa796)
return C;
// 10 characters
if (C <= 0xa7a8)
return C | 1;
// LATIN CAPITAL LETTER H WITH HOOK
if (C == 0xa7aa)
return 0x0266;
// LATIN CAPITAL LETTER REVERSED OPEN E
if (C == 0xa7ab)
return 0x025c;
// LATIN CAPITAL LETTER SCRIPT G
if (C == 0xa7ac)
return 0x0261;
// LATIN CAPITAL LETTER L WITH BELT
if (C == 0xa7ad)
return 0x026c;
// LATIN CAPITAL LETTER SMALL CAPITAL I
if (C == 0xa7ae)
return 0x026a;
// LATIN CAPITAL LETTER TURNED K
if (C == 0xa7b0)
return 0x029e;
// LATIN CAPITAL LETTER TURNED T
if (C == 0xa7b1)
return 0x0287;
// LATIN CAPITAL LETTER J WITH CROSSED-TAIL
if (C == 0xa7b2)
return 0x029d;
// LATIN CAPITAL LETTER CHI
if (C == 0xa7b3)
return 0xab53;
if (C < 0xa7b4)
return C;
// 2 characters
if (C <= 0xa7b6)
return C | 1;
if (C < 0xab70)
return C;
// 80 characters
if (C <= 0xabbf)
return C + -38864;
if (C < 0xff21)
return C;
// 26 characters
if (C <= 0xff3a)
return C + 32;
if (C < 0x10400)
return C;
// 40 characters
if (C <= 0x10427)
return C + 40;
if (C < 0x104b0)
return C;
// 36 characters
if (C <= 0x104d3)
return C + 40;
if (C < 0x10c80)
return C;
// 51 characters
if (C <= 0x10cb2)
return C + 64;
if (C < 0x118a0)
return C;
// 32 characters
if (C <= 0x118bf)
return C + 32;
if (C < 0x1e900)
return C;
// 34 characters
if (C <= 0x1e921)
return C + 34;
return C;
}
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